<template>
  <div class="tags-view-container">
    <el-scrollbar class="tags-view-wrapper">
      <router-link
        class="tags-view-item"
        :class="isActive(tag) ? 'active' : ''"
        :style="{
          backgroundColor: isActive(tag) ? $store.getters.cssVar.menuBg : '',
          borderColor: isActive(tag) ? $store.getters.cssVar.menuBg : '',
        }"
        v-for="(tag, index) in $store.getters.tagsViewList"
        :key="tag.fullPath"
        :to="{ path: tag.fullPath }"
        @contextmenu.prevent="openMenu($event, index)"
      >
        {{ tag.title }}
        <template v-if="!isAffiix(tag)">
          <Close
            @click.prevent.stop="onCloseClick(index, tag)"
            class="el-icon-close"
          />
        </template>
      </router-link>
    </el-scrollbar>
    <context-menu
      v-show="visible"
      :style="menuStyle"
      :index="selectIndex"
    ></context-menu>
  </div>
</template>

<script setup>
import { Close } from "@element-plus/icons";

import ContextMenu from "./ContextMenu.vue";
import { ref, reactive, watch, onMounted } from "vue";
import { useRoute, useRouter } from "vue-router";
import { useStore } from "vuex";
// import store from '@/store'

const route = useRoute();

onMounted(() => {});

/**
 * 是否被选中
 */
const isActive = (tag) => {
  return tag.path === route.path;
};
const isAffiix = (tag) => {
  return tag.meta && tag.meta.affix;
};
// contextMenu 相关
const selectIndex = ref(0);
const visible = ref(false);
const menuStyle = reactive({
  left: 0,
  top: 0,
});
/**
 * 展示 menu
 */
const openMenu = (e, index) => {
  const { x, y } = e;
  menuStyle.left = x + "px";
  menuStyle.top = y + "px";
  selectIndex.value = index;
  visible.value = true;
};

/**
 * 关闭 tag 的点击事件
 */
const store = useStore();
const router = useRouter();

const onCloseClick = (index, tag) => {
  store.commit("app/removeTagsView", {
    type: "index",
    index: index,
  });

  //如果删除的是当前页面，自动定位到上一个页面
  if (isActive(tag)) {
    let tagsViewList = store.getters.tagsViewList;
    if (index == 0 && tagsViewList.length >= 1) {
      let pre_index = 0;
      let pre_page = tagsViewList[pre_index];
      router.push(pre_page.fullPath);
    } else if (tagsViewList.length == 0) {
      //如果是最后一个，定位到首页
      router.push("/");
    } else {
      let pre_index = index - 1;
      let pre_page = tagsViewList[pre_index];
      router.push(pre_page.fullPath);
    }
  }
};

/**
 * 关闭 menu
 */
const closeMenu = () => {
  visible.value = false;
};

/**
 * 监听变化
 */
watch(
  visible,
  (val) => {
    if (val) {
      document.body.addEventListener("click", closeMenu);
    } else {
      document.body.removeEventListener("click", closeMenu);
    }
  },
  {
    immediate: true,
  }
);
</script>

<style lang="scss" scoped>
.tags-view-container {
  height: 34px;
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #d8dce5;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.12), 0 0 3px 0 rgba(0, 0, 0, 0.04);

  .tags-view-item {
    display: inline-block;
    position: relative;
    cursor: pointer;
    height: 26px;
    line-height: 26px;
    border: 1px solid #d8dce5;
    color: #495060;
    background: #fff;
    padding: 0 8px;
    font-size: 12px;
    margin-left: 5px;
    margin-top: 4px;

    &:first-of-type {
      margin-left: 15px;
    }

    &:last-of-type {
      margin-right: 15px;
    }

    &.active {
      color: #fff;

      &::before {
        content: "";
        background: #fff;
        display: inline-block;
        width: 8px;
        height: 8px;
        border-radius: 50%;
        position: relative;
        margin-right: 4px;
      }
    }

    // close 按钮
    .el-icon-close {
      height: 1em;
      width: 1em;
      line-height: 10px;
      vertical-align: -2px;
      border-radius: 50%;
      text-align: center;
      transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
      transform-origin: 100% 50%;

      &:before {
        transform: scale(0.6);
        display: inline-block;
        vertical-align: -3px;
      }

      &:hover {
        background-color: #b4bccc;
        color: #fff;
      }
    }
  }
}
</style>
